You would normally connect external speakers to a laptop using the laptop's headphone port. The cable coming from the speakers would normally have a green connector on the end and would plug directly in.

If you have a bigger, more complex speaker system then you would need to determine what connections are possible to the speakers and what outputs are provided on your laptop. The most common audio out ports (for PC's, not so much laptops) are SP-DIF Coaxial and Optical. These would provide full digital surround sound signals from your computer but are not found commonly on laptops.

My best guess would be the above green connector to headphone port setup. The rest is a bit optimistic for an everyday laptop.

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The replacement panels for the Compaq 6720s range between $85.00 USD and $110.00 USD depending on where you order them from. The replacement is a relatively easy procedure, but I don't recommend it for a first-time novice do-it-yourselfer.
Here are links to some places where you can order the display panel:
http://www.blisscomputers.net/hp-compaq-6720s-laptop-lcd-screen-15-4-wxga-glossy-ccfl.aspx
http://www.screencountry.com/index.php?section=products&model=HP%20COMPAQ%206720S&brand=HP-Compaq
http://www.r3electronics.com/index.php?option=com_virtuemart&Itemid=1&page=shop.product_details&flypage=flypage.tpl&product_id=1147&category_id=38
Now the good news is you can still use your laptop if you have an external monitor. You can use the appropriate "Fn" key combination to switch your display output to the external device. I believe for the Compaq 6720 is the "Fn" key & the "F4" key. Connect the external monitor then power on your machine, Press the Fn and F4 key simultaneously until you get the display showing on the external device.
One more thing, you will need to go set the laptop to not do anything when the lid is closed. You can do this via Start -> Control Panel -> Power Settings. Change the custom power settings for both "A/C" Power and "Battery Power" to "do nothing" when the lid is closed. By doing so, you can close the laptop lid without shutting off the computer. Of course you will need to add an external mouse and keyboard to continue using the computer, but by following these instructions, you can basically use the laptop, even with a damaged screen, pretty much the same way you would use a desktop. The portability is lost, but the function is retained until you can have a new display panel installed.
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hello sir
first you please tell me your speaker company.......ok doesn't matter much
are you sure it is not muted..........or tell me did u install or remove any sofware programme
tell me so that we can solve your problem as soon we can